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A Computer-Aided Design and Synthesis Environment for Analog by Geert Van der Plas

By Geert Van der Plas

In the 1st half the AMGIE analog synthesis method is defined. AMGIE is the 1st analog synthesis method that automates the whole layout method from requirements all the way down to tested structure. it truly is exact to the layout of moderate-complexity circuits. It is dependent upon layout and circuit wisdom saved within the tool's libraries and will be utilized by either amateur and skilled analog designers in addition to system-level designers. the internal workings are defined intimately, with (practical) examples to illustrate how the carried out algorithms and strategies paintings. Experimental effects acquired with the AMGIE method are suggested, together with real fabricated and measured circuits.

The moment technique, i.e. the systematic layout of high-performance analog circuits, is mentioned within the moment a part of the ebook. This process is supported by way of instruments to spice up the productiveness of the clothier. An instance of one of these instrument is Mondriaan, that's special in the direction of the automated structure new release of hugely general analog blocks. The proposed systematic layout method is then utilized to the layout of high-accuracy current-steering electronic to analog converters (DACs). the whole layout course is mentioned intimately.

Both complementary techniques raise analog layout productiveness. layout occasions of the various layout experiments undertaken are suggested through the ebook to illustrate this.

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A Geometric Program (GP) [Duff 67] is an optimization problem of the following form: let x be a vector of n real, positive variables and where are posynomial functions and are monomial functions. , t = 1, f is a monomial function. A geometric program is convex by definition, and the local optimum that is found using interior point methods is thus the global optimum. At this end of the spectrum almost no CPU time is required to size analog circuits (less than 60 seconds for a 15 transistor OTA).

Are technology dependent constants. 6. Also other device geometry parameters like ps, pd, nrs, nrd are derived in this way. These are essential to estimate during circuit sizing parasitics of the devices like the bulk capacitances, extrinsic drain/source resistances, etc. 4. The technology info model parameters: these define extra technology-specific infor- mation used to characterize the devices. For example, the width and length of MOS transistors are constrained between a minimal and possibly maximal value, and they need to be snapped to grid.

4 AMGIE uses a functional decomposition of circuits. This hierarchy leads to the definition of functionblocks in the cell library. Examples of typical functionblocks are: OPAMP, OTA, COMPARATOR, SWITCAP_BIQUAD, CSA-PSA. A/DCONVERTER, D/A-CONVERTER, … These functionblocks define an interface and a parameterized behavior. These behavioral parameters are the functionblock’s specifications. Every point tool of the system uses the 40 Detailed Description of the AMGIE Analog Synthesis System values of the specification parameters to select its design decisions.

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